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Note 10 - Leases (Details Textual) $ in Thousands, ₨ in Millions, $ in Millions		3 Months Ended		12 Months Ended
	Aug. 05, 2016 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2018 USD ($)	Jan. 31, 2017 USD ($)	Jan. 31, 2019 USD ($)	Jan. 31, 2017 CAD ($)	Aug. 05, 2016 INR (₨)
Finance Lease, Right-of-Use Asset		$ 400
Operating Lease, Liability, Total		10,309
Operating Lease, Right-of-Use Asset		10,323
Finance Lease, Liability, Total		473
Operating Lease, Expense		$ 700	$ 700
Minimum [Member]
Lessee, Operating Lease, Term of Contract		1 year
Maximum [Member]
Lessee, Operating Lease, Term of Contract		14 years
Finance Vehicle Equipment, One [Member]
Finance Lease, Right-of-Use Asset				$ 800		$ 1.1
Finance Vehicle Equipment, One [Member] | Minimum [Member]
Interest Rate for Finance Lease				4.00%
Finance Vehicle Equipment, One [Member] | Maximum [Member]
Interest Rate for Finance Lease				7.80%
Finance Lease, Principal Payments and Interest Payment on Liability				$ 100
Finance Vehicle Equipment, Two [Member]
Finance Lease, Right-of-Use Asset	$ 8						₨ 0.6
Interest Rate for Finance Lease	15.60%
Finance Vehicle Equipment, Two [Member] | Maximum [Member]
Finance Lease, Principal Payments and Interest Payment on Liability	$ 1

X

- Definition

Amount of cash outflow for principal payment and interest on finance lease liability.

+ References

No definition available.

+ Details

Name:	ppih_FinanceLeasePrincipalPaymentsAndInterestPaymentOnLiability
Namespace Prefix:	ppih_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Contractual interest rate for finance lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppih_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
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- Details

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X

- Details

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X

- Details

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